Twin-bolster cradle on bogies for railway rolling stock



Dec. 1, 1953 G. BORGEAUD ET AL TWIN-BOLSTER CRADLE O N BOGIES FOR RAILWAY ROLLING STOCK 2 Sheets-Sheet 1 Filed D60. 29, 1949 INVENTORS;

Dec. 1, 1953 G. BORGEAUD ET AL TWIN-BOLSTER CRADLE 0N BOGIES FOR RAILWAY ROLLING STOCK 2 Sheets-Sheet 2 4 Filed Dec. 29, 1949 IN VE N TORS Z a f. w a fl WWW aw 3 m4 afit Patented Dec. 1, 1953 TWIN-BOLSTER CRADLE ON BOGIES FOR RAILWAY ROLLING STOCK Gaston Borgeaud and Jakob Waldvogel, Winterthur, Switzerland, assignors to Schweizerische Lokomotivund Maschinenfabrik, Winterthur,

Switzerland Application December 29, 1949, Serial No. 135,806

Claims priority, application Switzerland December 30, 1948 4 Claims. (01. 105188) Our present invention relates to bogies of railway rolling stock in which the vehicle body is supported on a cradle which is suspended from the bogie. The cradle comprises a plurality of longitudinal spring packs and two bolsters, and the bogie is spring-supported on the vehicle axle boxes.

When the bogie comprises an uneven number of axles of which one has to be disposed in the bogie center, a cradle arrangement is used wherein bolsters are disposed both fore and. aft of the bogie center, the bolsters being suspended from the bogie frame in a transversely oscillatable relation. The said center axle then is situated symmetrically with respect to the cradle or bolsters.

In such cradle-and-bogie arrangements it is known to rigidly interconnect the two bolsters, the connection with the vehicle body being established through the king pin which is engaged in the rigid connecting parts. Such known arrangement, however, has the disadvantage of too great a weight and of requiring too much space.

It further is known in the art to suspend'each of the two bolsters per se from the bogie frame in'lateral'ly oscillatable relation, and to support the vehicle body, through elements forming part ofa circular ring, on sliding-surfaces provided at the ends of the bolsters. The said surfaces are provided with vertical guide ledges of cylindrical form which guide the said elements secured to the vehicle body on a circle of great radius about the bogie centenand which establish connection between the two bolsters and the vehicle body.

In such known arrangement, however, it hardly is possible to avoid too high a position of the parts transmitting the tension and transverse forces between vehicle body and bolsters, which high'position is of disadvantage in operation.

In accordance with the present invention, the connection of the two bolsters with the vehicle body is established through a two-arm lever which is rotatably mounted on the king pin. The said lever is disposed in the longitudinal direction of .the bogie and always is held substantially parallel to the longitudinal axis of the bogie by guide means, and. the ends of said lever are connected to a bolster each by, means of a swivel joint, I

An embodiment of the invention as applied to a six-wheel bogie is shown, by way of example, in the accompanying drawing, in which:

Fig. 1 shows a cross-section of the bogie on the line 1-1 of Fig. 2, Fig. 1a is a section on line Ia-Ia of Fig. l, Fig. 1b is a vertical section of a swivel joint,

Fig. 2 is a plan view,

Fig. 3 shows a modification in section on the line IIIIII of Fig. 4, and Fig. 4 shows the modification in plan.

In the example shown, the laterally spaced,

' longitudinally extending spring packs are separated and disposed both outside and inside of the two center wheels.

The bogie frame I through springs 2a is resiliently supported on the vertically movable axle boxes 2 of the three bogie axles. Only the intermediate axle 3 is shown in Fig. l, and in Fig. 2 only the wheels l3 thereof are indicated. The sole-bars l of the bogie frame are interconnected through the transoms 5 fore and aft of the intermediate axle. The members4 and 5 are built as box girders. Bolsters 6 are disposed below the transoms 5 and fore and aft of the bogie center, one to each side of the central axle. Each bolster 6 is suspended through links I and pivots 8 from the bogie frame in a laterally oscillatable relation, and each comprises two fiat plates or pieces of plate stock'set on edge. The ends [0 of each pair of plates are pivoted on a pin 9 to an equalizer H. The ends l2 of the longitudinal springs l5, l6 which are disposed inside and outside, respectively, of the wheels l3 of the intermediate axle, are each pivoted on a pin M to the ends of said equalizers, and the axes of the pins I4 are disposed in planes parallel to and intermediate of the bolster plates.

The vehicle subframe I8, through shoes 2| fixed thereto, isslidably supported on the plane faces 30 of intermediate elements 23, which, for the purpose of, good adjustability, rest through spherically adapted faces 22 on the bands [9 and 20 of the longitudinal spring packs. The. said spring bands are swiveled to the bogie frame by means of links 24 so that the springs l5 and [6, with respect to the bogie frame as a whole, can only move laterally. The springsthem selves, however, also can be vertically deflected with their bands. v T

The depressedking pin 25 which is fixed to the vehicle subframe I8, is engaged in a twoarm transverse lever 26 ofwhich the free ends are swiveled to rods 21 which in turn are swiveled on pins 28 fixed to the bogie frame. The rods 21 through king pin 25 transmit the longitudinal forces (drawing and braking forces) from the subframe 18 to the bogie frame and vice versa. Two further arms 33, extending in the longitudinal direction of the vehicle, are fixed to the boss of the transverse lever 26, and the free ends of the arms 33 are swiveled to rods 34 which in turn are swiveled to the bolsters 6 on pins 35.

The said rigging serves for the purpose of taking the two bolsters along in the same direction when the vehicle body moves laterally with respect to the bogie. In such case, the bolsters 6, being suspended on the hangers 1', may oscillate laterally with respect to the bogie frame, and the arms 33, owing to the linkage 26 and 21, always remain substantially parallel to the longitudinal axis of the bogie. The entire arrangement allows the bogie to move laterally and vertically and also to'swing about a vertical axis relatively to the vehicle subframe 18. During the latter movement, the subframe l8 slides on the plane surfaces 30 of the shoe -2 l. 7

It is to be noted that the connections between the members 8 and s, 24 and 4, 24 and-20, 2B and 21, 33 and 34 and 35 and the connection at 8 are in the nature of ball or swivel joints in order to permit at least some degree of universal movement, as shown in Fig. 1b.

Inplace of the lever system 26, 21 shown, which engages the king pin 25, a conventional transverse slot 36 in a longitudinal 35 of the bogie frame may be provided for the king pin, the latter being equipped with a sliding block 31. Suchmodificatioriis shown in Fig. 4, and in longitudinal section in Fig. 3. A v

In such latter case, the two' arms 26 and rods 21 aremissing, and the boss 39 embracingthe king pin 25 comprises only the two longitudinal arms A-s showninF-igl 3, the boss 39 and the arms 33 have to be disposed above the block 31 on the king pin for example, and have to be fixed to the block 31 so that the arms 33 always aresubstantially parallel to the longitudinal direction ofthe bogie.

I Especially in the arrangement described last, the two pins 35 may be disposed on one and the same side with respect to the longitudinal median plane of the vehicle, instead of on opposite sides thereof, so that the rods 3? point in the same direction. 7

It will be readily appreciated from the drawing that the entire cradle, including the vehiclesupporting springs and the rods connecting the cradle with the vehicle body and bolster, may be depressed, i. 'e.- disposed below'the bogie frame. Such depressed position, as known in the art, favors a smooth running of the vehicle. The arrangement shown also is of advantage for decreasing the weight (if the cradle.

It is within the scope of our present invention to modify the afiangeinent of the cradle springs, e'. g. by providing only two outsidespring packs 16', in which case the ends of the latter are directly connected to the'bolsters' 6, in a manner similar to that shown in the Swiss specification No. 254,704. Reference is also made to the applicants prior'Patent No. 2,515,812, dated July What we claim as new and desire to secure by Letters Patent, is:

1., In a railway-vehicle bogie which is springsupported on the axle boxes and from which the vehiclebody is suspended on hangers by means an intermediary cradle comprising a transversely os'cillatable parallel bolster both fore and aft of the bogie center wheels, in combination with a king pin fixed to the vehicle body, the

4 improvement comprising a two-arm lever swiveled at its center to the king pin and at its ends to the two bolsters, and means interconnected between said two arm leverand said-:bcgie frame operative for holding said lever substantially parallel to the longitudinal axis of the bogie.

2. In a railway-vehicle bogie which is springsupported onthe axle bOXes and from which the vehicle body is suspended on hangers by means or" an intermediary cradle comprising a transversely oscillatable bolster both fore and aft of the bogie center Wheels, in combination with a king pin fixed to the vehicle body, the improvement comprising a first two-arm lever disposed in the longitudinal direction of the bogie and swiveled at its center to the king pin and at its ends to rods which in turn are swiveled to each bolster, and a second two-arm lever disposed at right angles to the first lever and swiveled at its center to the king pin and at its ends to the bogie frame through" intermediary rods; the second lever acting as guide for the first lever to hold the latter always substantially parallel to the longitudinal axisof the h'ogie.

3. In a' railway-vehiclebogie'which is springsupported on the axle boxes and from which the vehicle body is suspended on hangers by means of an intermediary cradle comprising a transversely oscil'l'atab'le bolster both fore and aft of the bogie center wheels, in combination with a king pin fixed to the vehicle body and connected to a bogie longitudinal by a slot-and-block means in swivelable relation, the improvement comprising a two-arm lever disposed in the longitudinal direction of the bogie andiixedat its center to said block and at its ends to rods which in turn are swiveled to each bolster the whole in such arrangement being such as to hold the said lever always substantially parallel to the longitudinal axis of the bogie;

4. In a railway vehicle bogie which is springsupported on the axle boxes and from which the vehicle body is suspended on hangers by means of an intermediary cradle comprising a trans versely oscillata'ble parallel bolster both fore and aft of the bogie center wheels, in combination with a king pin: fixed to the vehicle body, a twoarm lever having the ends of both arms pivotally connected by rods to eachbolster, a laterally guided member surrounding the king pin and fixed to the central portion of said two-arm lever, said member being operatively connected to the bogie frame so as to hold said lever substantially parallel to; the longitudinalaxis of the bogie.

GASTON BORGEAUD. JAKOB WALDVOGEL.

References Cited in the file of this patent UNITED"STATES PATENTS Number Name Date 131,544; Barnes July 8, 1890 2,288,383 Anderson June 30, 1942 2,330,994 Prantl n Oct. 5, 1943 2,515,812 waldvogel et a1. July 18, 1950 FOREIGN PATENTS.

Number country Date 121,468 Sweden Apr. 20, 1948 

